开发过程中经常会遇到设置redis key前缀的场景，尤其是有多条业务线，op都会给各条业务线分配特定的前缀，例如：baidu:baijiayun:xxxxx ，开发者每次拼接key的时候都要去拼接该前缀，很是麻烦，这里提供一种思路，java数据传输之前要通过，某种方式（各种序列化框架）序列化，此时可以在业务完成之后，在序列化的时候将前缀加进去

@Configuration
public class AlyRedisConfigration {

    @Value("${redis.commonPrefix}")
    private String prefix;

    @Bean
    @ConfigurationProperties(prefix = "redis")
    public SingleRedisConfig alyRedisConfiguration() {
        return new SingleRedisConfig();
    }

    @Bean("alyConnectionFactory")
    public LettuceConnectionFactory alyConnectionFactory(SingleRedisConfig alyRedisConfiguration) {
        return alyRedisConfiguration.getConnectionFactory();
    }

    @Bean
    public AlyRedisTemplate alyRedisTemplate(
        @Qualifier("alyConnectionFactory") LettuceConnectionFactory alyConnectionFactory) {
        AlyRedisTemplate alyRedisTemplate = new AlyRedisTemplate();

        alyRedisTemplate.setConnectionFactory(alyConnectionFactory);
        alyRedisTemplate.setKeySerializer(prefixRedisSerializer());
        return alyRedisTemplate;
    }

    private RedisSerializer<String> prefixRedisSerializer() {
        return new PrefixRedisSerializer(prefix);
    }

    /**
     * 给redis的key加上前缀，如果不需要前缀，可以通过Template的execute方法直接调用connection里的操作。
     */
    static class PrefixRedisSerializer implements RedisSerializer<String> {
        private final RedisSerializer<String> delegate = RedisSerializer.string();

        private final String prefix;

        public PrefixRedisSerializer(String prefix) {
            this.prefix = prefix;
        }

        @Override
        public byte[] serialize(String s) throws SerializationException {
            return delegate.serialize(prefix + s);
        }

        @Override
        public String deserialize(byte[] bytes) throws SerializationException {
            return delegate.deserialize(bytes);
        }
    }

}